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In this paper we examine the importance of local spilloverssuch as network externalities • and learning from othersin the diffusion of home computers. We use data on 110,000 U.S. • households in 1997. Controlling for many individual characteristics, we find that people are more likely to buy their first home computer in areas where a high fraction of(More)
This paper presents evidence that the spread between the marginal product of capital and the return on nancial assets is much higher in poor than in rich countries. A model with costly inter-mediation is developed. In this economy, individuals choose at each instant whether to work or to operate a technology. Entrepreneurs nance their business with their(More)
We present a dynamic model of the hospital industry in which nonprofit and for-profit hospitals coexist and compete and are differentiated by their objective functions, investment technologies, and taxation rates. In our model, patients differ by income and type of insurance coverage, and choose admission to their preferred hospital, while hospitals choose(More)
Contingent valuation is used to value tropical forest resources for a rural population in Africa. Welfare losses from land-use restrictions associated with a newly established national park in Madagascar are estimated with a willingness-to-accept format. Because of a limited local cash economy, the contingent valuation question is denominated in baskets of(More)
Weidner and participants at the USC Applied Micro Workshop. Huseyin Gunay and Heonjae Song provided able research assistance. Any opinions, findings, and conclusions or recommendations in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation, the Federal Reserve Bank of San Francisco or the(More)
OBJECTIVE To identify reliable predictors of outcome in comatose patients after cardiac arrest using a single routine EEG and standardized interpretation according to the terminology proposed by the American Clinical Neurophysiology Society. METHODS In this cohort study, 4 EEG specialists, blinded to outcome, evaluated prospectively recorded EEGs in the(More)
Why do growth and net exit rates of establishments decline with size? What determines the size distribution of establishments? This paper presents a theory of establishment dynamics that simultaneously rationalizes the basic facts on economy-wide establishment growth, net exit, and size distributions. The theory emphasizes the accumulation of(More)
In high-tech industries, one important method of diffusion is through employee mobility: many of the entering firms are started by employees from incumbent firms using some of their former employers' technological know-how. This paper explores the effect of incorporating this mechanism in a general industry framework by allowing employees to imitate their(More)
Exposure atmospheres for rodent inhalation toxicology studies were generated to enable the evaluation of biological responses to a simulated downwind coal combustion atmosphere. A composition representing a single test case of emissions components as they may exist tens to hundreds of miles from a coal-fired power plant was developed. The particulate matter(More)